If I have already got 4GB (2x2GB sicks Kingston HyperX Blue DDR3) in my machine and i then install a 4GB stick along side of the existing 4GB will it cause problems. The ram will be the same make/model/speed just a different sized stick. would it cause problems when installed (like not registering the full amount)
It depends on your OS and whether you have 32 bit or 64.
crucial shows some of the limits, although not all are included.
[URL]http://www.crucial.com/support/recognize_memory.aspx[/URL]